This was an incredible year for science and engineering. We sent a powerful robot scientist to Mars, and we discovered the elusive Higgs Boson particle, plus there were world-changing innovations in medicine and materials science. We sequenced the genome of a human ancestor, and looked into the mind of an artificial intelligence that recognized the content of images on the web for the first time (of course it included cat faces). Here are the seventeen biggest scientific breakthroughs of 2012.

NASA's Curiosity Rover Lands on Mars

NASA's one-ton, six-wheel-drive, nuclear-powered science laboratory — aka Curiosity — touched down on the surface of Mars in early August, following an eight-month voyage across millions of miles of space. It is far and away the biggest and most scientifically capable rover ever sent to another planet. The landing sequence, alone, which required lowering the rover to the surface of the planet from a hovering, rocket-powered sky crane, was the most technically impressive ever attempted, and played out beautifully.

Think you've seen the internet's best video of Curiosity descending to the surface of…
Read more Read more

Today, just five months into Curiosity's two-year primary mission, the rover is still just stretching its legs, but has already made several intriguing discoveries. In the months to come, the rover will begin poring over the pages of Mars' history, as it scans the layers of sedimentary rock comprising Mount Sharp in search of signs of whether the planet can, or ever could, support life.

Right now, there is a neural network of 1,000 computers at Google's X lab that has taught…
Read more Read more

Ancient DNA from Denisovans Sheds Light on What Made Homo sapiens Successful

This year, an international group of scientists completed a highly detailed analysis of DNA from what is estimated to be a 50-80,000 year old finger bone from a group of early humans called Denisovans. And it offered a glimpse at the genes that may have given modern humans an edge over our extinct counterparts. What the researchers found is that Denisovans shared a lot of genetic material with our human cousins, the Neanderthals. What set modern humans apart from both groups was a small set of genes that are related to brain development and cognition. It's possible that Homo sapiens survived, while our human cousins did not, because of something to do with how our brains worked. From this Denisovan DNA, we also learned more about where Neanderthals and Denisovans lived, and how they migrated across Europe and Asia long before Homo sapiens ever got the idea to leave Africa. Thanks to this research, we have a more detailed picture than ever of what human life was like tens of thousands of years ago.

It's official (unofficially) — scientists at CERN have found the most compelling evidence yet…
Read more Read more

Researchers publish ENCODE, the "Encyclopedia" of DNA

In what is arguably the biggest milestone for genetics since the publication of the human genome, researchers this year debuted The Encyclopedia of DNA Elements Project (aka The "ENCODE" Project), publishing 30 papers across three different scientific journals with the aim of cataloguing not just the genome's various component parts, but what those components actually do. Among the initiative's many findings was that so-called "junk DNA" - outlier DNA sequences that do not encode for protein sequences - are not junk at all, and are in fact responsible for such things as gene regulation, disease onset, and even human height.

Researchers Create a Mammal Entirely from Stem Cells

For the first time in history, researchers at Kyoto University created a mouse by using eggs derived from stem cells alone. The achievement once again shows the remarkable possibilities presented by regenerative technologies like stem cells, while raising pressing ethical questions about the potential for human births in which parents might not be required.

This Electronic Implant can Dissolve Inside Your Body

The boundary that divides man from machine continues to dissolve — often in more literal ways than you might imagine. Scientists in September announced a new class of implantable electronics that can carry out a designated task for anywhere from a few hours to several weeks before disappearing completely, resorbing into the body after serving its purpose. The potential applications of this technology — dubbed "Transient Electronics" by its creator, bioengineer John Rogers — are many, and run the gamut from vanishing biological implants to environmentally friendly phones.

The First Study to Examine What Happens to Women Denied Abortions

For the first time in history, a group of researchers did a longitudinal study of what happens to women who seek out abortions, but are denied them under restrictive legal frameworks. The UC San Francisco research team followed nearly 1,000 women from diverse backgrounds across the U.S. over several years, after they were unable to have their abortions. What they discovered was that these women were more likely to slip below the poverty line, be unemployed, remain in abusive relationships with the fathers of their children, and feel stressed out from having too many responsibilities. Only a tiny percentage of them put their babies up for adoption, and most already had children before seeking an abortion. What this ongoing study demonstrates is that abortion is an economic issue for women, with dire consequences for those denied them.

The National Interagency Fire Center is reporting that the United States has established a new…
Read more Read more

Autism Symptoms Were Reversed in Mice

Every year we learn more about the many mechanisms that can trigger autism, a complicated spectrum disorder that is still poorly understood. One incredible study this year offered hope for researchers seeking a way to understand how autism develops in some people, and perhaps one day craft a targeted gene therapy. Using mice with autism-like symptoms caused by a genetic mutation, the researchers figured out how to administer a protein that reversed the symptoms. No, it will not lead to a cure any time soon. It will lead to something better: An understanding of the many ways autism can start.

A team of researchers at McGill University in Montreal announced that they've successfully…
Read more Read more

A Working Tractor Beam

An experiment revealed that tractor beams are within our reach. For the first time, researchers demonstrated in the lab that a Bessel beam could be used to move a tiny silica sphere back and forth, drawing it toward and away from the source of the laser light. Though it had been theorized that Bessel beams worked like this, nobody had been able to do it. The team did this by essentially creating a strobe effect, using multiple lenses to create overlapping beams and adjusting the beams' relative phases. This provided the required energy to move the object toward the beam.

Sex often fuels the adoption of cutting-edge technology, even in the burgeoning field of…
Read more Read more

The Most Comprehensive Face Transplant in History

Yes, there have been face transplants before, but this was the first full-face transplant — and it worked marvelously well. The recipient had lost most of his face in a gun accident, and now has a full face that he was able to move within days of his surgery. This will lead to many more people gaining a new lease on life with a face that functions almost as well as the one they were born with — and possibly, better.

In 1997, Richard Norris was shot in the face. The accident almost cost him his life, and, even…
Read more Read more

There Is More Water Than We Thought in the Solar System

This was the year of water in our solar system. We already had strong evidence of plentiful water on the Moon, and this year we found it for Mars, Jupiter's moon Europa and Mercury — plus we got more detailed images of Saturn moon Titan's river systems, which probably flow with liquid methane and ethane. Water on other planets isn't exactly like water on Earth — usually it's packed with hydrocarbons, or is extremely brackish. But now at least we have evidence that water isn't as usual as we thought out there. Future space colonists may be able to mine for water on other words, using refineries to purify it into something potable.

This image was taken by the space probe Cassini, and shows what appears to be a massive river…
Read more Read more

A Virus That Creates Electricity

One day you could power your laptop just by typing. And you'll do it by using a virus called M13. The secret of M13 lies in something called the "piezoelectric effect," which happens when certain materials like crystals (or viruses) emit a small amount of power when squeezed. M13 exhibits this effect, and also has the handy ability to organize itself into tidy, invisible sheets of film. Imagine painting a layer of this film onto the casing for your laptop. Every time you tap the keyboard, these viruses convert the pressure from your fingers into electricity that constantly powers up your battery. Any kind of motion can power up M13, so you could conceivably power your house by jumping up and down on a virus-coated floor, or power your iPod by jiggling it in your pocket. Also, don't worry about a scary M13 pandemic where people start squeezing each other for energy. M13 only infects bacteria, so it is harmless to humans.